Gislov, Sweden

My grandfather August Parson from Gislov, Sweden.Born Dec 31,1863.Was a halfbrother to Marten,Jon,Kjersti Lovisa and Olof Martensson.I would like to know if anyone might know the family of the Martensson,I was told some came to New York.I have never been able to locate any of this family...Respectfully yours Allen